Correct Answer - Option 3 : 3 (L-1) – 2J – H
The degree of freedom is equal to the number of independent coordinates require to specify its configuration, i.e., the relative positions of all the links.
According to Kulzbeck law,
F = 3 (L - 1) - 2 j - h
where, L = no. of links, j = no. of joints, h = no. of higher pairs